The shower head lights shine with different colors, depending on temperature:
| Under 32°C | White | |
| 33°C to 41°C | blue and dark blue | |
| 42°C to 45°C | pink and violet | |
| Over 45°C | hot red |
Having a sort of light show while you shower is a cool idea. That "hot red" light might be a good safety feature, too. 45°C is 113°F. Somewhere over that, you get into a range where scalds are possible, at least according the American Burn Association (pdf-format campaign kit).
More ideas - good, dubious, and strange - at "Better Ideas From ... "
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